Nozzle assembly for a vacuum device

Details Nozzle assembly for a vacuum device Nozzle assembly for a vacuum device

1990-12-17

1992-01-14

Coe, Philip R.

Brushing, scrubbing, and general cleaning

Machines

With air blast or suction

285 7, 285376, 285401, A47C 902

Patent

active

050797964

ABSTRACT:
An arrangement for attaching a rigid vacuum conduit to a nozzle provides high rotational freedom between the nozzle and the rigid conduit while retaining a reasonable degree of airtightness between the conduit and the nozzle. In one form of the invention, the rigid vacuum conduit includes a coupling section of generally cylindrical form adapted to be received into an inlet opening of the nozzle. The coupling section includes a plurality of spaced grooves, each circumscribing the coupling section. The presence of the grooves reduces the frictional loading between the vacuum conduit and the inlet opening while providing a trap for dirt particles that would otherwise jam the vacuum conduit into fixed position in the nozzle. In a further version of the invention, the rigid vacuum conduit comprises metallic material. To reduce frictional loading between such metallic material and the inlet opening of the nozzle, an annular band of low friction material encircles a coupling section of the vacuum conduit. The annular band may comprise a nonmetallic material and may be formed of a pair of cooperating sections.

REFERENCES:
patent: 2659616 (1953-11-01), Doyle
patent: 3069186 (1962-12-01), Stevens
patent: 3239244 (1966-03-01), Leinfelt
patent: 3309113 (1967-03-01), Beach

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